[FEA] Add JNI for `replace_nans`

**Is your feature request related to a problem? Please describe.**
There is an issue in spark-rapids that needs the JNI of `replace_nans` in cuDF: https://github.com/NVIDIA/spark-rapids/issues/6276

This is **not** a blocker of https://github.com/NVIDIA/spark-rapids/issues/5320.

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**Additional context**
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